public class GuessDate {
  private final static int[][][] dates = {
    {{ 1,  3,  5,  7},
     { 9, 11, 13, 15},
     {17, 19, 21, 23},
     {25, 27, 29, 31}},
    {{ 2,  3,  6,  7},
     {10, 11, 14, 15},
     {18, 19, 22, 23},
     {26, 27, 30, 31}},
    {{ 4,  5,  6,  7},
     {12, 13, 14, 15},
     {20, 21, 22, 23},
     {28, 29, 30, 31}},
    {{ 8,  9, 10, 11},
     {12, 13, 14, 15},
     {24, 25, 26, 27},
     {28, 29, 30, 31}},
    {{16, 17, 18, 19},
     {20, 21, 22, 23},
     {24, 25, 26, 27},
     {28, 29, 30, 31}}};

  /** Prevent the user from creating objects from GuessDate */ 
  private GuessDate() {
  }

  /** Return a date at the specified row and column in a given set */ 
  public static int getValue(int setNo, int i, int j) {
    return dates[setNo][i][j];
  }
}
